My little bro just got his new M3DS Real and an 8gb Class 6 Sandisk microSD with it. I set it up for him, but every now or then a certain game will get to the point of coming up with the "loading" image (the one with "Game Patch 4.3f" in the corner). On the bottom screen shall be a message saying "Save file format error!". I'm pretty sure it is an SD error as I tested my SD on it and it worked fine, but is there any way I can get it back in working order? He's really disappointed that his Sonic Chronicles save is gone. 2 Things I can't do: 1) Reformat - Reformatted 4 times to no avail. 2) Buy a new SD - I'm not in the position to do that.